#include <iostream>
#include <string>
#include <pthread.h>
#include <unistd.h>
using namespace std;

const int num = 5;

pthread_mutex_t gmutex = PTHREAD_MUTEX_INITIALIZER;

// 引入条件变量
pthread_cond_t gcond = PTHREAD_COND_INITIALIZER;

void *Wait(void *args)
{
    string name = static_cast<const char *>(args);
    while (true)
    {
        // pthread_cond_wait(&gcond, &gmutex /*?*/);
        pthread_mutex_lock(&gmutex);

        pthread_cond_wait(&gcond, &gmutex /*?*/); // 这里就是线程等待的位置

        usleep(1000);
        cout << "I am : " << name << endl;

        pthread_mutex_unlock(&gmutex);
        // usleep(100000);
    }
}

int main()
{
    pthread_t threads[num];
    for (int i = 0; i < num; i++)
    {
        char *name = new char[1024];
        snprintf(name, 1024, "thread - %d ", i + 1);
        pthread_create(threads + i, nullptr, Wait, (void *)name);
        usleep(10000);
    }

    sleep(1);

    // 唤醒其他线程
    while (true)
    {
        pthread_cond_signal(&gcond); // 一个一个唤醒
        // pthread_cond_broadcast(&gcond);
        //  cout << "唤醒一个线程 ..." << endl;
        cout << "唤醒线程 ..." << endl;
        sleep(2);
    }

    for (int i = 0; i < num; i++)
    {
        pthread_join(threads[i], nullptr);
    }

    return 0;
}